/Engine/Source/Runtime/Engine/Public/SceneInterface.h
Reads back reflection capture data from the GPU. Very slow operation that blocks the GPU and rendering thread many times.
virtual void GetReflectionCaptureData ( [UReflectionCaptureComponent](API\Runtime\Engine\Components\UReflectionCaptureComponent) * Component, class [FReflectionCaptureData](API\Runtime\Engine\Engine\FReflectionCaptureData) & OutCaptureData )